Boiler-tube scraper and cleaner



(No Model.)

H. S. INGALLS. BOILER TUBE SGRAPER AND CLEANER.

No. 442,320. Patented Dec. 9, 1890.

a v r UNiTEp STATES PATENT OFFICE.

HORACE S. INGALLS, OF MELR-OSE, ASSIGNOR OF ONE-HALF TO J. F. & C. G.\VARREN & 00., OF IVORCESTER, MASSACHUSETTS.

BOILER-TUBE SCRAPER AND CLEANER.

SPECIFICATION forming part of Letters Patent No. 442,320, dated December9, 1890.

Application filed July 23, 1890- Serial No.359,681- (No model.)

To all whom it may concern.-

Be it known that I, HORACE S. INGALLS, oi Melrose, in the county ofMiddlesex and State of Massachusetts, have invented certain new anduseful Improvements in Boiler Tube Scrapers and Cleaners; and I dohereby declare that the following is a full, clear, and exactdescription thereof, reference being had to the accompanying drawings,forminga part of this specification, and in which- Figure 1 represents aside view of my improved tube scraper and cleaner, and Fig. 2 is acentral longitudinal section thereof.

My invention consists in certain improve- 5 ments in the construction ofthe jointed scraping-arms and the means employed for im parting an endyielding pressure to hold said arms in their normal expanded positions,as hereinafter more fully set forth.

To enable'others skilled in the art to which my said inventionappertains to better understand the nature and purpose thereof, I willnow proceed to describe it more in detail.

In the drawings, A represents part of the rod to which the scraper issecured, said rod being turned into a threaded opening in the nut B. Theusual spindle O is also turned into the opposite end of said nut, and isfastened in position from turning out by the 0 set-nut D, both the rodand spindle being threaded for the above purpose. At about the middle ofthe spindle a flanged bearing piece E is secured thereto by providingthe same with a central threaded opening, so that 3 5 it may be turnedonto the threaded portion a of said spindle. Said bearing may be heldfrom turning after being fitted to the spindle by means of a set-screwb. To the flanges c of bearing E are pivoted the inner ends of 40 theusual scraping-arn'is F, four of which are shown in this instance. Saidarms are provided with the usual inclined or curved scraping-edges F,and their outer ends are pivoted to the inner ends of links G, whoseouter ends are in turn pivoted to the flanges (Z of bearing H, fitted toslide on the outer end of the spindle.

Upon the inner ends of the scraping-arms are formed cam projections 6,extending inward against the spindle when the device is in its normal orexpanded position, as shown in the drawings. Against said camprojections is fitted a ring I, which is in turn fitted to slide on thespindle, and between the ring and nut D is interposed a strong spiralspring 5 5 .I, which is fitted loosely over the spindle and exerts aconstant pressure against the ring to force and hold the arms and linksin their expanded positions, while at the same time permitting them toyield inward to conform to the pressure imparted thereto in pushing anddrawing the device through the boilertubes in the operation of scrapingand cleaning the same. The arms and links are thus forced outward by thering bearing on the innor ends of said arms inside of the line of theirpivot f, as is shown in the drawings.

It will thus be seen that the device, while yielding readily, is at thesame time held sufficiently firm against outside pressure to produce agood, strong, and serviceable scraper, not easily get out of repair andwhich maybe manufactured cheaply.

The general principle of the device, it will be understood, is not new,and I therefore limit my invention to the specific construction shownand described for eifectin g the desired result.

\Vhat I claim as new, and desire to secure by Letters Patent, is

1. In a boiler-tube scraper and cleaner, the

spindle C, the inner flanged bearing E, secured thereto, and the outerflanged bearing II, fitted to slide thereon, in combination with thescraper-arms F and links G, pivoted together, the inner ends of saidarms being also pivoted to bearing E and the links to bearing II, ring1, bearing against the inner ends of scraping-arms F, and a suitablespring for forcing the same against said arms, substan- 9o tially as setforth.

2. In a boiler-tube scraper and cleaner, the nut B, adapted to hold therod A and spindle O, set-nut D, said spindle C, and the inner flangedbearing E, secured to the spindle, in 5 combination with scraper-arms F,having the cam projections e on their inner ends, also I spring forforcing the same against said arms, pivoted at said inner ends to thebearing E substantially as set forth.

and at their other ends to links G, said links G pivoted to hearing H asWell as the arms, I HORACE INGALLS' 5 said bearing H fitted to slide onthe outer end Vitnesses:

of the spindle, ring I, bearing against the in- C. F. \VESSON,

ner ends of scraping-arms F, and a suitable LoUIsB. TENNY.

